screen saver(s)

screenSaver/.package

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+{
+	title = 'Screen Savers',
+	repository = 'kepler155c/opus-apps/{{OPUS_BRANCH}}/screenSaver',
+	description = [[ Various screen savers ]],
+	license = 'MIT',
+}

screenSaver/autorun/saver.lua

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+local Config = require('opus.config')
+local Util   = require('opus.util')
+
+local fs         = _G.fs
+local kernel     = _G.kernel
+local multishell = _ENV.multishell
+local window     = _G.window
+
+if not multishell then
+    return
+end
+
+local config = Config.load('saver', {
+	enabled = true,
+    timeout = 60,
+    random = true,
+    specific = nil,
+})
+
+local BASE   = '/packages/screenSaver'
+local SAVERS = fs.combine(BASE, 'savers')
+
+local timer = config.enabled and os.startTimer(config.timeout)
+local saverUid
+
+local function showScreenSaver()
+    timer = nil
+
+    local files = fs.list(SAVERS)
+    local saver = config.specific or fs.combine(SAVERS, files[math.random(1, #files)])
+
+    local w, h = kernel.terminal.getSize()
+    local win = window.create(kernel.terminal, 1, 1, w, h, true)
+    saverUid = multishell.openTab({
+        path = saver,
+        focused = true,
+        title = 'Saver',
+        window = win,
+    })
+end
+
+kernel.hook({ 'mouse_up', 'mouse_drag', 'key_up' }, function()
+    if config.enabled then
+        if timer then
+            os.cancelTimer(timer)
+            timer = os.startTimer(config.timeout)
+        elseif saverUid then
+            multishell.terminate(saverUid)
+            saverUid = nil
+            timer = os.startTimer(config.timeout)
+        end
+    end
+end)
+
+kernel.hook('timer', function(_, eventData)
+    if timer and eventData[1] == timer then
+        showScreenSaver()
+    end
+end)
+
+kernel.hook('config_update', function(_, eventData)
+    if eventData[1] == 'saver' then
+        Util.merge(config, eventData[2])
+        if timer then
+            os.cancelTimer(timer)
+            timer = nil
+        end
+        if config.enabled then
+            timer = os.startTimer(config.timeout)
+        end
+    end
+end)

screenSaver/etc/fstab

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+sys/apps/system/saver.lua linkfs packages/screenSaver/system/saver.lua
+packages/screenSaver/savers/timespace.lua urlfs https://raw.githubusercontent.com/Allen2277/Computercraft/master/Time%20Space%20Screensaver
+packages/screenSaver/savers/visualizer.lua urlfs https://raw.githubusercontent.com/Allen2277/Computercraft/master/ScreenSaver
+packages/screenSaver/savers/random.lua urlfs https://pastebin.com/raw/XXW0r5zt
+packages/screenSaver/savers/melting.lua urlfs http://pastebin.com/raw/raUv6Pap
+packages/screenSaver/savers/bubbles.lua urlfs https://pastebin.com/raw/3CeFxk9X
+packages/screenSaver/savers/fire.lua urlfs https://pastebin.com/raw/4CY4AYj3
+packages/screenSaver/savers/rain.lua urlfs https://pastebin.com/raw/P86Hm99N

screenSaver/savers/life.lua

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+--(c) 2013 Felix Maxwell
+--License: CC BY-SA 3.0
+--http://www.computercraft.info/forums2/index.php?/topic/12239-100-screensavers-game-of-life-and-matrix/
+
+-- modified for use in Opus
+
+local fps = 4 --Determines how long the program will wait between each tick
+local char = "\127" --Live cells will look like this
+
+local colors = _G.colors
+local term   = _G.term
+
+local function randomColor()
+	return 2 ^ math.random(0, 14)
+end
+
+local function printCharAt( monitor, x, y, ch )
+	monitor.setCursorPos( x, y )
+	monitor.write( ch )
+end
+
+local function getNumNeighborhood( grid, x, y )
+	local neighbors = 0
+	if x > 1 then
+		if y > 1 then
+			if grid[x-1][y-1] == char then neighbors = neighbors + 1 end
+		end
+		if grid[x-1][y] == char then neighbors = neighbors + 1 end
+		if y < #grid[x] then
+			if grid[x-1][y+1] == char then neighbors = neighbors + 1 end
+		end
+	end
+
+	if y > 1 then
+		if grid[x][y-1] == char then neighbors = neighbors + 1 end
+	end
+	if y < #grid[x] then
+		if grid[x][y+1] == char then neighbors = neighbors + 1 end
+	end
+
+	if x < #grid then
+		if y > 1 then
+			if grid[x+1][y-1] == char then neighbors = neighbors + 1 end
+		end
+		if grid[x+1][y] == char then neighbors = neighbors + 1 end
+		if y < #grid then
+			if grid[x+1][y+1] == char then neighbors = neighbors + 1 end
+		end
+	end
+
+	return neighbors
+end
+local function lifeOrDeath( cur, neighbors )
+	if neighbors < 2 then
+		return " "
+	elseif neighbors > 3 then
+		return " "
+	elseif neighbors == 3 then
+		return char
+	else
+		return cur
+	end
+end
+
+local function tick( monitor, grid )
+	local retGrid = {}
+	for x=1,#grid do
+		retGrid[x] = {}
+		for y=1,#grid[x] do
+			local num = getNumNeighborhood( grid, x, y )
+			retGrid[x][y] = lifeOrDeath( grid[x][y], num )
+			if retGrid[x][y] ~= grid[x][y] then
+				printCharAt( monitor, x, y, retGrid[x][y] )
+			end
+		end
+	end
+	return retGrid
+end
+
+local function setup( w, h )
+	local grid = {}
+	for i=1,w do
+		grid[i] = {}
+		for o=1,h do
+			if math.random(1, 5) == 1 then
+				grid[i][o] = char
+			else
+				grid[i][o] = " "
+			end
+		end
+	end
+	return grid
+end
+
+local function run()
+	local monitor = term.current()
+	if monitor.isColor() then
+		monitor.setTextColor(colors.lime)
+		monitor.setBackgroundColor(colors.black)
+	end
+	local w, h = monitor.getSize()
+	local grid
+
+	local delay = 1/fps
+	local timerId = os.startTimer(delay)
+	local reset = 0
+	while true do
+		local e, id = os.pullEvent()
+		if e == 'key' or e == 'char' or e == 'mouse_click' then
+			break
+		end
+		if e == 'timer' and id == timerId then
+			if reset == 0 then
+				reset = 300
+				monitor.setTextColor(randomColor())
+				grid = setup(w, h)
+				monitor.clear()
+			end
+			reset = reset - 1
+			grid = tick( monitor, grid )
+			timerId = os.startTimer(delay)
+		end
+	end
+end
+
+run()
+term.setCursorPos(1, 1)
+term.clear()

screenSaver/system/saver.lua

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+local Config = require('opus.config')
+local UI     = require('opus.ui')
+
+local config = Config.load('saver', {
+	enabled = true,
+    timeout = 60,
+})
+
+local tab = UI.Tab {
+	tabTitle = 'Screen Saver',
+	description = 'Screen saver',
+	label1 = UI.Text {
+		x = 2, y = 3,
+		value = 'Enabled',
+	},
+	checkbox = UI.Checkbox {
+		x = 20, y = 3,
+		value = config.enabled
+	},
+	label2 = UI.Text {
+		x = 2, y = 4,
+		value = 'Timeout',
+	},
+	timeout = UI.TextEntry {
+		x = 20, y = 4, width = 6,
+		limit = 4,
+		transform = 'number',
+		value = config.timeout,
+		accelerators = {
+			enter = 'update',
+		},
+	},
+	button = UI.Button {
+		x = 20, y = 6,
+		text = 'Update',
+		event = 'update',
+	},
+}
+
+function tab:eventHandler(event)
+	if event.type =='checkbox_change' then
+		config.enabled = not not event.checked
+
+	elseif event.type == 'update' then
+		config.timeout = self.timeout.value
+		Config.update('saver', config)
+
+		self:emit({ type = 'success_message', message = 'Settings updated' })
+		os.queueEvent('config_update', 'saver', config)
+	end
+	return UI.Tab.eventHandler(self, event)
+end
+
+return tab